int exec(t_box *tab, int it)
{
int i;
int k;
k = 0;
if (it == 1)
i = 0;
else if (it == 2)
i = 1;
while (cmpter(tab->opr[k], tab->sign[i], NULL, 1) == 1)
k = k + 1;
tab->rez = tab->ftab[k](tab->nb[i], tab->nb[i + 1]);
stocker(tab);
return (0);
}
int main(int argc, char *argv[]){
//Attempt to create shared memory object. If it succeeds, initialize everything that will be shared
int fd = shm_open("/potshop",O_CREAT|O_RDWR|O_EXCL,0777);
if (fd >= 0){ //Shared memory did not already exist, so we fill it
errcheck = ftruncate(fd,memSize);
if (errcheck != 0){
printf("Error truncating shared memory. Exiting.\n");
return 1;
}
void *mem = mmap(NULL,memSize,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
if (mem == MAP_FAILED){
printf("Error mapping shared memory. Exiting.\n");
return 1;
}
sm = (struct memStruct*)mem;
errcheck = sem_init(&sm->apSem,0,1);
if (errcheck != 0){
printf("Error initializing process counter semaphore. Exiting.\n");
return 1;
}
sm->activeProcesses = 1;
errcheck = sem_init(&sm->sharedMemSem,0,1);
if (errcheck != 0){
printf("Error initializing shared memory semaphore. Exiting.\n");
return 1;
}
//Create potionList using input file
FILE *potionList = fopen("inventory_input.txt","r");
if (potionList == NULL){
printf("Input file not found. Please make sure there is a file in the current directory called \"inventory_input.txt\" and try again.\n");
return 1;
}
sm->numPotionTypes = fgetc(potionList) - '0';
int i;
char nextLine[40];
struct potion potArray[10];
fgets(nextLine,40,potionList); //Read the next line from input file.
for (i=0;i<sm->numPotionTypes;i++){
fgets(nextLine,40,potionList); //Read the next line from input file.
sscanf(nextLine,"%s %d",&potArray[i].name,&potArray[i].available); //Parse the line and fill in a potion.
}
//Add potions array to our shared memory
memcpy(&sm->potions,&potArray,sizeof(potArray));
} else { //shared memory object did exist. so open it for read/write!
fd = shm_open("/potshop",O_RDWR,0777);
if (fd == -1){
printf("Error opening shared memory. Exiting.\n");
return 1;
}
void *mem = mmap(NULL,memSize,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
if (mem == MAP_FAILED){
printf("Error mapping shared memory. Exiting.\n");
return 1;
}
sm = (struct memStruct*)mem;
sm->activeProcesses++;
}
printf("Welcome to Uncle Trapspringer and Fizban the Fabulous's Potion Emporium!\n");
char input = '3';
while(input != '1' && input != '2'){
printf("Are you a customer or stocker?\n1. Customer\n2. Stocker\n");
scanf("%c",&input);
}
if(input == '1'){
purchaser();
}
else if(input == '2'){
stocker();
}
sm->activeProcesses--;
//Destroy all resources only when they're not needed any longer. ie: process counter is 0
if (sm->activeProcesses == 0){
errcheck = sem_destroy(&sm->sharedMemSem);
if (errcheck != 0){
printf("Error destroying shared memory semaphore. Exiting.\n");
return 1;
}
errcheck = sem_destroy(&sm->apSem);
if (errcheck != 0){
printf("Error destroying active process semaphore. Exiting.\n");
return 1;
}
errcheck = shm_unlink("/potshop");
if (errcheck != 0){
printf("Error unlinking shared memory. Exiting.\n");
return 1;
}
}
return 0;
}
